from django.db import models

from apps.core.models import TimeStampedModel, UUIDModel


class Permission(UUIDModel):
    code = models.CharField(max_length=120, unique=True)
    description = models.CharField(max_length=255, blank=True)

    def __str__(self) -> str:
        return self.code


class Role(UUIDModel, TimeStampedModel):
    name = models.CharField(max_length=120)
    slug = models.SlugField(max_length=120, unique=True)
    description = models.CharField(max_length=255, blank=True)
    permissions = models.ManyToManyField(Permission, through="RolePermission", related_name="roles", blank=True)

    def __str__(self) -> str:
        return self.name


class RolePermission(UUIDModel):
    role = models.ForeignKey(Role, on_delete=models.CASCADE)
    permission = models.ForeignKey(Permission, on_delete=models.CASCADE)

    class Meta:
        constraints = [
            models.UniqueConstraint(fields=["role", "permission"], name="uniq_role_permission")
        ]


class UserRole(UUIDModel, TimeStampedModel):
    user = models.ForeignKey("accounts.User", on_delete=models.CASCADE, related_name="user_roles")
    role = models.ForeignKey(Role, on_delete=models.CASCADE, related_name="user_roles")
    scope = models.JSONField(default=dict, blank=True)

    class Meta:
        constraints = [
            models.UniqueConstraint(fields=["user", "role"], name="uniq_user_role")
        ]